At Burberry she joined a star-studded front row that included the model Rosie Huntington-Whiteley, the singer Will.I.Am, the actress Kate Bosworth and an of-the-moment Korean band named Girls' Generation that reduced the crowd outside to hysterical shrieks.

Burberry has become Britain's pre-eminent fashion brand thanks to its canny combination of fashion classics and state-of-the-art selling techniques: last night's "Town & Field" collection continued that trend, presenting tweed, cord, horse-blanket and khaki coats that boasted enormous field pockets perfect for stashing a grouse - or the latest tablet computer.

Every item on the catwalk, from the peplummed, 1940's horsewoman's skirts to the quilted handbag with a golden duck's head clasp, was available for near-instant purchase online and beamed to big screens in locations including Beijing and Heathrow's Terminal 5. The finale saw models hoist umbrellas as the roof of the transparent show-tent was spattered with artificial rain from the outside (it was a sunny evening in Kensington) and confetti rained down inside.

Backstage, Burberry's affable Yorkshireman designer Christopher Bailey said: "I find rainy days more emotive than sunny days, I like the melancholy of rain. Sometimes it makes you stop and do interesting things. I like taking all these clichés and these very familiar things and playing with them a little bit. Because behind every cliché I think there is usually something a bit more profound."

Earlier, Mrs Cameron nipped in through a side-entrance of the new White Cube Gallery in Bermondsey, East London, to see work of a designer she has often worn herself. Erdem Moragliou garlands his neatly-silhouetted, feminine dresses with flower upon flower upon flower and this show boasted more blooms than Chelsea, via floral lace overlays and blurrily kaleidoscopic bouquets prints encrusted with coloured Swarovski crystal.

As well as seeing this fantastic collection up close Mrs Cameron also received a free St Tropez "skin finish" tan courtesy of a gift-card left on her seat. Whether policy permitted her to snaffle it into the pocket of her business like trouser suit is unclear.

The fashion "ambassador's" first show of the day was that of Christopher Kane, a brilliant and intense Scotsman. Featuring hologram-effect moiré dresses bordered with wadded lines of black leather, as well as pinstriped leather and mink and a dash of violet and blue leopard-print, this was altogether a more demanding collection of clothes to wear. And - given the theme - it would perhaps be inappropriate for the fashion ambassador to do so.

Kane said his collection was "dirty, grungy and rocky." Not really Mrs Cameron's cup of tea. Late last night she was also due to attend the London show of McQ, Alexander McQueen's second line.